Workplace overexertion combined with hypertension caused a stroke, qualifying as an external cause of a work accident under Polish law.

The Supreme Court dismissed the cassation appeal and allowed the claimant's request to recognize a stroke as a work accident. The court found that excessive physical labor, specifically lifting heavy boxes, combined with the claimant's pre-existing hypertension, caused the stroke with high probability. Although the employer argued the condition was a natural progression of illness, the court ruled that the work conditions constituted an external cause under the relevant statute.